remove _ in causes.csv

[sequencer]

I think these names should be aligned, not matter with _ or not with _

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.53%. Comparing base (5a22f44) to head (5500518).
Report is 7 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #255      +/-   ##
==========================================
- Coverage   92.97%   92.53%   -0.45%     
==========================================
  Files           3        3              
  Lines         655      656       +1     
==========================================
- Hits          609      607       -2     
- Misses         46       49       +3     

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[aswaterman]

I agree it's illogical to use spaces for some and underscores for others.